From the upstream advisory [1]:
OpenSSL server code for ephemeral ECDH ciphersuites is not thread-safe, and
furthermore can crash if a client violates the protocol by sending handshake
messages in incorrect order. (CVE-2011-3210)
This issue applies to OpenSSL 0.9.8 through 0.9.8s (experimental "ECCdraft"
ciphersuites) and to OpenSSL 1.0.0 through 1.0.0d.
Affected users of OpenSSL should update to the OpenSSL 1.0.0e release, which
contains a patch to correct this issue. If you cannot immediately upgrade,
we recommend that you disable ephemeral ECDH ciphersuites if you have enabled
them.
Thanks to Adam Langley <agl@chromium.org> for identifying and fixing this
issue.
Only server-side applications that specifically support ephemeral ECDH
ciphersuites are affected by the ephemeral ECDH crash bug and only if
ephemeral ECDH ciphersuites are enabled in the configuration. You can check
to see if application supports ephemeral ECDH ciphersuites by looking for
SSL_CTX_set_tmp_ecdh, SSL_set_tmp_ecdh, SSL_CTRL_SET_TMP_ECDH,
SSL_CTX_set_tmp_ecdh_callback, SSL_set_tmp_ecdh_callback,
SSL_CTRL_SET_TMP_ECDH_CB in the source code.
[1] http://www.openssl.org/news/secadv_20110906.txt
Statement:
Not vulnerable. This issue did not affect the versions of openssl as shipped with Red Hat Enterprise Linux 3, 4, 5, or 6, as they do not include the support for the elliptic curve cryptography.